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Basis of Preparation And Significant Accounting Policies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2018
Basis of Preparation and Significant Accounting Policies [line items]
Working capital deficit		$ (43,323)
Increase/ decrease in voyage revenues	$ 233
Increase/ decrease in voyage expenses	$ 233

X

- Definition

The increase (decrease) during the reporting period in expenses arising from rendering of services.

+ References

No definition available.

+ Details

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Namespace Prefix:	glbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in revenues arising from rendering of services.

+ References

No definition available.

+ Details

Name:	glbs_IncreaseDecreaseVoyageRevenues
Namespace Prefix:	glbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of current assets less the amount of current liabilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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